<A HREF="http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=679778#679778" target="_new">I asked about the same question there</A>
Basically thereis 3 Mobile barton available, 2400/2500 and 2600. I didn't find the answer I needed, but here is my conclusion :
Since I don't want to change my DDR333 memory to DDR400/433. I think the Mobile 2600+ is a better choice, because it runs at 2.13GHz (133*16). So, if I buy one I could try 167*16 = 2.66GHz. I think the Mobile 2600+ have the advantage of HIGHER maximum multiplier and it's unlocked. And for the price : it's only 8$US more.
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Would you buy a potato powered chipset?